//Ʒͼ
$.fn.infiniteCarousel = function () {

    function repeat(str, num) {
        return new Array( num + 1 ).join( str );
    }
  
    return this.each(function () {
        var $wrapper = $('> div', this).css('overflow', 'hidden'),
            $slider = $wrapper.find('> ul'),
            $items = $slider.find('> li'),
            $single = $items.filter(':first'),
            
            singleWidth = $single.outerWidth(), 
            visible = Math.ceil($wrapper.innerWidth() / singleWidth), 
            currentPage = 1,
            pages = Math.ceil($items.length / visible);            


        // 1. Pad so that 'visible' number will always be seen, otherwise create empty items
        if (($items.length % visible) != 0) {
            $slider.append(repeat('<li class="empty" />', visible - ($items.length % visible)));
            $items = $slider.find('> li');
        }

        // 2. Top and tail the list with 'visible' number of items, top has the last section, and tail has the first
        $items.filter(':first').before($items.slice(- visible).clone().addClass('cloned'));
        $items.filter(':last').after($items.slice(0, visible).clone().addClass('cloned'));
        $items = $slider.find('> li'); // reselect
        
        // 3. Set the left position to the first 'real' item
        $wrapper.scrollLeft(singleWidth * visible);
        
        // 4. paging function
        function gotoPage(page) {
            var dir = page < currentPage ? -1 : 1,
                n = Math.abs(currentPage - page),
                left = singleWidth * dir * visible * n;
            
            $wrapper.filter(':not(:animated)').animate({
                scrollLeft : '+=' + left
            }, 500, function () {			

/* if (currentPage==pages) {
 $wrapper.stop();
 $('a.forward').click($('a.forward').unbind());
 $('a.back').click($('a.back').unbind());
} */
/*if(currentPage==pages==1){  
$wrapper.stop();
 $('a.forward').click($('a.forward').unbind());
 $('a.back').click($('a.back').unbind());
 alert(page)
	}else if(currentPage!=page){
 if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                   $wrapper.scrollLeft(singleWidth * visible);
                    page = 1;
                }
 }*/

                if (page == 0) {
                    $wrapper.scrollLeft(singleWidth * visible * pages);
                    page = pages;
                } else if (page > pages) {
                   $wrapper.scrollLeft(singleWidth * visible);
                    page = 1;
                } 

                currentPage = page;
            });                
            
            return false;
        }
        
        $wrapper.after('<a class="arrow back">&lt;</a><a class="arrow forward">&gt;</a>');
        
        // 5. Bind to the forward and back buttons
		
		
      $('a.back', this).click(function () {
        if(currentPage==1){
            $wrapper.stop();
        }else{
		    if(pages==1){
			    $wrapper.stop();
		    }else{ return gotoPage(currentPage - 1); }
		}
										//alert("back");
			//$('a.forward').bind("click");							  
          
        });
	  $('a.forward', this).click(function () {
	    if(currentPage==pages){
            $wrapper.stop();
        }else{
		    if(pages==1){
			    $wrapper.stop();
		    }else{ 
                return gotoPage(currentPage + 1); 
		    }
		}
			
//alert("forward");
			//$('a.back').bind("click");
       });
	  
	  /*$('a.back', this).bind("click",function(){
											  
										
			return gotoPage(currentPage - 1);
			})
	  
        
/*        $('a.forward', this).click(function () {
											 
		$('a.back').bind("click",function(){
										
			return gotoPage(currentPage - 1);})
				
        });*/

/*$('a.forward', this).bind("click",function(){
										   alert("back");
            return gotoPage(currentPage + 1);
});*/


        
        // create a public interface to move to a specific page
        $(this).bind('goto', function (event, page) {
            gotoPage(page);
        });
    });  
};

$(document).ready(function () {
  $('.infiniteCarousel').infiniteCarousel();
});




$(document).ready(function(){

$(".wrapper a").click(function(){
$(".wrapper a:first").addClass("active");
// ǰСͼ
$(".wrapper").find(".active").removeClass("active");
$(this).addClass("active");})
})
